Fair Value Measurements (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Fair Value and Cost of Non-Derivative Instruments

	March 31, 2014				December 31, 2013
$ in millions	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets
Money Market Funds	$	0.1	$	0.1	$	0.3	$	0.3
Equity Securities		2.8		3.7		3.3		4.4
Debt Securities		4.8		4.9		5.4		5.5
Hedge Funds		0.8		0.9		0.9		0.9
Real Estate		0.4		0.4		0.4		0.4
Total Assets	$	8.9	$	10.0	$	10.3	$	11.5
Liabilities
Debt	$	2,294.4	$	2,364.2	$	2,294.4	$	2,334.6

Fair Value and Redemption Frequency

Fair Value Estimated Using Net Asset Value per Unit
$ in millions	Fair Value at March 31, 2014		Fair Value at December 31, 2013		Unfunded Commitments		Redemption Frequency
Money Market Fund (a)	$	0.1	$	0.3	$	-	Immediate
Equity Securities (b)		3.7		4.4		-	Immediate
Debt Securities (c)		4.9		5.5		-	Immediate
Hedge Funds (d)		0.9		0.9		-	Quarterly
Real Estate (e)		0.4		0.4		-	Quarterly
Total	$	10.0	$	11.5	$	-

Fair Value of Assets and Liabilities Measured on Recurring Basis

Assets and Liabilities at Fair Value on a Recurring Basis
			Level 1		Level 2		Level 3
$ in millions	Fair Value at March 31, 2014		Based on Quoted Prices in Active Markets		Other Observable Inputs		Unobservable Inputs
Assets
Master Trust Assets
Money Market Funds	$	0.1	$	0.1	$	-	$	-
Equity Securities		3.7		-		3.7		-
Debt Securities		4.9		-		4.9		-
Hedge Funds		0.9		-		0.9		-
Real Estate		0.4		-		0.4		-
Total Master Trust Assets		10.0		0.1		9.9		-
Derivative Assets
Heating Oil		0.1		0.1		-		-
Forward Power Contracts		19.7		-		19.7		-
Total Derivative Assets		19.8		0.1		19.7		-
Total Assets	$	29.8	$	0.2	$	29.6	$	-
Liabilities
Derivative Liabilities
FTRs	$	0.1	$	-	$	-	$	0.1
Forward Power Contracts		33.2		-		33.2		-
Total Derivative Liabilities		33.3		-		33.2		0.1
Long-term Debt		2,364.2		-		2,345.8		18.4
Total Liabilities	$	2,397.5	$	-	$	2,379.0	$	18.5

Assets and Liabilities at Fair Value on a Recurring Basis
			Level 1		Level 2		Level 3
$ in millions	Fair Value at December 31, 2013		Based on Quoted Prices in Active Markets		Other Observable Inputs		Unobservable Inputs
Assets
Master Trust Assets
Money Market Funds	$	0.3	$	0.3	$	-	$	-
Equity Securities		4.4		-		4.4		-
Debt Securities		5.5		-		5.5		-
Hedge Funds		0.9		-		0.9		-
Real Estate		0.4		-		0.4		-
Total Master Trust Assets		11.5		0.3		11.2		-
Derivative Assets
FTRs		0.2		-		-		0.2
Heating Oil Futures		0.2		0.2		-		-
Forward Power Contracts		13.4		-		13.4		-
Total Derivative Assets		13.8		0.2		13.4		0.2
Total Assets	$	25.3	$	0.5	$	24.6	$	0.2
Liabilities
Derivative Liabilities
Forward Power Contracts	$	10.6	$	-		10.6	$	-
Total Derivative Liabilities		10.6		-		10.6		-
Long-term debt		2,334.6		-		2,316.1		18.5
Total Liabilities	$	2,345.2	$	-	$	2,326.7	$	18.5

Fair Value Measurements, Nonrecurring [Table Text Block]

$ in millions	Three months ended March 31, 2014
		Carrying	Fair Value							Gross
		Amount		Level 1		Level 2		Level 3		Loss
Assets
Long-lived assets held and used (a)
DP&L (East Bend)	$	14.2	$	-	$	-	$	2.7	$	11.5
Goodwill (b)
DPLER Reporting unit	$	135.8	$	-	$	-	$	-	$	135.8

DP&L [Member]

Fair Value and Cost of Non-Derivative Instruments

	March 31, 2014				December 31, 2013
$ in millions	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets
Money market funds	$	0.1	$	0.1	$	0.3	$	0.3
Equity securities		2.8		3.7		3.3		4.4
Debt securities		4.8		4.9		5.4		5.5
Hedge funds		0.8		0.9		0.9		0.9
Real estate		0.4		0.4		0.4		0.4
Total assets	$	8.9	$	10.0	$	10.3	$	11.5
Liabilities
Debt	$	877.1	$	878.6	$	877.1	$	859.6

Fair Value and Redemption Frequency

Fair Value Estimated Using Net Asset Value per Unit
$ in millions	Fair Value at March 31, 2014		Fair Value at December 31, 2013		Unfunded Commitments		Redemption Frequency
Money market fund (a)	$	0.1	$	0.3	$	-	Immediate
Equity securities (b)		3.7		4.4		-	Immediate
Debt securities (c)		4.9		5.5		-	Immediate
Hedge funds (d)		0.9		0.9		-	Quarterly
Real estate (e)		0.4		0.4		-	Quarterly
Total	$	10.0	$	11.5	$	-

Fair Value of Assets and Liabilities Measured on Recurring Basis

Assets and Liabilities at Fair Value on a Recurring Basis
			Level 1		Level 2		Level 3
$ in millions	Fair Value at March 31, 2014		Based on Quoted Prices in Active Markets		Other Observable Inputs		Unobservable Inputs
Assets
Master trust assets
Money market funds	$	0.1	$	0.1	$	-	$	-
Equity securities		3.7		-		3.7		-
Debt securities		4.9		-		4.9		-
Hedge funds		0.9		-		0.9		-
Real estate		0.4		-		0.4		-
Total Master trust assets		10.0		0.1		9.9		-
Derivative assets
FTRs		-		-		-		-
Heating Oil		0.1		0.1		-		-
Forward power contracts		20.0		-		20.0		-
Total derivative assets		20.1		0.1		20.0		-
Total assets	$	30.1	$	0.2	$	29.9	$	-
Liabilities
Derivative liabilities
FTRs	$	0.1	$	-	$	-	$	0.1
Forward power contracts		33.5		-		33.5		-
Total derivative liabilities		33.6		-		33.5		0.1
Long-term debt		878.6		-		860.2		18.4
Total liabilities	$	912.2	$	-	$	893.7	$	18.5

Assets and Liabilities at Fair Value on a Recurring Basis
			Level 1		Level 2		Level 3
$ in millions	Fair Value at December 31, 2013		Based on Quoted Prices in Active Markets		Other Observable Inputs		Unobservable Inputs
Assets
Master trust assets
Money market funds	$	0.3	$	0.3	$	-	$	-
Equity securities		4.4		-		4.4		-
Debt securities		5.5		-		5.5		-
Hedge Funds		0.9		-		0.9		-
Real Estate		0.4		-		0.4		-
Total Master trust assets		11.5		0.3		11.2		-
Derivative assets
Heating oil futures		0.2		0.2		-		-
FTRs		0.2		-		-		0.2
Forward power contracts		13.4		-		13.4		-
Total Derivative assets		13.8		0.2		13.4		0.2
Total assets	$	25.3	$	0.5	$	24.6	$	0.2
Liabilities
Derivative liabilities
Forward power contracts		10.6		-		10.6		-
Total Derivative liabilities		10.6		-		10.6		-
Long-term debt		859.6		-		841.1		18.5
Total liabilities	$	870.2	$	-	$	851.7	$	18.5